Vibratory screen



June 7, 1938. J. MESS ET AL VIBRATORY SCREEN Filed April so, 1937 2 Sheets-Sheet 1 June 7, 1938. J. MESS ET AL 2,120,032

VIBRATORY SCREEN Filed April 30, 1937 2 Sheets-Sheet 2 Patented June 7, 1938 PATENT oFFlcE I VIBRATORY SCREEN James Mess and Robert Stroud, Toronto, Ontario,

Canada, assignors to Niagara Screens & Ma-

chines Application April 30,

6 Claims.

This invention relates to screening apparatus in which movement is imparted to screens, which are but slightly inclined, to facilitate the flow of discrete material over the screens and the 6 settling out of the smaller particles to passthrough the screen, and my object is to devise a simple, durable construction which will effectively handle a wide range of material.

This object we attain by means of a construction which may be briefly described as follows. A slightly inclined screen frame is gyrated in the planes of its screens by eccentric gyrating means, the connection with the frame being at one end and such that the screen frame may rock vertically about an axis adjacent the gyrating means.

The other end of the screen frame is' supported in such a way that it may move-longitudinally in response to the gyrating means but 20 not laterally, while means are provided to impart a vertical vibratory movement to said end.

The screen frame must also be rockable relative to the vibrating means on a vertical axis to permit of the gyratory movement taking place.

The invention is hereinafter more fully described'and is illustrated in the accompanying drawings in which Fig. 1 is a plan viewof the apparatus;

Fig. 2 a side elevation;

Fig. 3 an end view;

Fig. 4 a side elevation partly broken away of the discharge end of the screen frame and the supporting and vibrating means; and

Fig. 5 a section on the line 5-5 in Fig. 4.

In the drawings like numerals of reference indicate corresponding parts in the different figures. r

The device is carried on a main base I on which is mounted on one end a sub base 2, and a gyrat- 40 ing unit 3.

The gyrating unit 3 is driven by a motor 4 which is mounted on'the base I midway between its ends on a platform 5, through a V-belt 6 and pulleys 1, l The pulley I is secured to a I 45 horizontal shaft 8 which is journalled in the worm gear housing 9 of the gyrating unit 3. Secured to the shaft 8 and substantially midway between its journals is a worm I9 which drives the worm wheel II. The worm wheel I I is secured to the 50 vertical shaft I2. The vertical shaft I2 is jourf nalle'd in bearings I3, I5 on the worm gear housn'g 9. To the upper end of the vertical shaft I2 "secured;- a fly wheel I4. Mounted on the top Jot-the flyywheel I4 is a bearing I6 which is ec- 55 centric to the fly wheel I4. Journalled in the Limited, Toronto, Ontario, Canada 1937, Serial No. 139,857

bearing I6 is a pin H which is part of a bracket I8 which is secured to the screen frame I9. The bearing I6 must be of a self-alining type to permit the screen frame to rock in a vertical direction as hereinafter described. 5

The object of having the bearing I6 off the centre line on which the fly wheel I4 rotates is that the bearing I6 will transmit a gyrating motion through the pin I I and the bracket I8 to the screen frame I9. A thrust bearing 38 supports 0 the pin IT to hold up the bracket I8 clear of the housing of the bearing I6.

Carried in the screen frame I9 are one or more screens, the lower one of which is of a finer mesh than the upper one. On the other 15 end of the main base I is carried a vibrating unit 28. The vibrating unit '29 is driven by the motor 4 through the V-belt 2| and pulleys 22, 22. The pulley 22 is secured to a shaft 23 which is carried by the bearings 24, 24 on the main base. On the shaft 23 and on the inner side of the bearings 24, 24 and immediately adjacent thereto are fly wheels 25, 25. The shaft 23 between the two fly wheels 25, 25 is enclosed in a housing 26. Inside this housing at opposite ends are 5 two bearings 21, 21 (only one shown, see Fig.

5) which are eccentric to the bearings 24, 24. Secured to the housing 26 at each end is a saddle 31 which is flexibly and resiliently connected at its front end to the main base I by a spring 28 30' and bolt 29 to permit of small rocking movements of the end in a vertical longitudinal plane. Carried 'on the saddle 31 are bearing members 38 in which the V-tracks 3|, 3| are pivoted so that they may swing horizontally.

Carried on the angle members 34, 34 of the screen frame I9 and at the opposite end of the frame to the gyrating unit 3, are supports 32, 32 carrying journals 33, 33. Pivotally mounted on the journals 33, 33 of the supports 32, 32 are V- guides 36, 36 which rest on the V-tracks 3|, 3|.

Springs 35 have each an end connected to the angle members 34, 34 by means of a nut and bolt, and the other end to the saddle 31 of the vibrating unit 20. The springs 35,35 hold the V-guides 36, 36 against the V-tracks 3|, 3|.

The operation is as follows: The gyrating unit 3.is driven by the motor 4 by means already described. As the bearing I6 is mounted eccentrical ly on .the fly wheel I4 each time the fly wheel rotates, a combined longitudinal and lateral motion is given the screen frame I9. This gives the part of the screen nearest the gyrator a very extensive gyratory action in the plane'of the screen which diminishes towards the end of the screen over the vibrator unit 20.

The vibrating unit 20, which is driven by the motor 5 by means already described, gives a very sharp up and down vibration at a point at which there is little or no lateral motion imparted by the gyrating unit.

From the foregoing, it may be seen that the screen has a swinging or gyrating motion given it in an approximate horizontal plane by the gyrating unit as well as a vertical vibrating motion given it by the vibrating unit, and that the screen frame is so supported as to permit these movements to take place simultaneously.

It has been found that the gyrating motion is very valuable for screening certain types of material, and the vibrating motion for other types of screening, and that the combining of the two motions makes it possible for the screen to handle practically all types of material.

Usually the gyratory movement will be much slower than the vibratory movement but any ratio may, of course, be arranged by varying the drive.

What we claim as our invention is:

1. Screening apparatus comprising a base; a screen frame; gyrating means on the base adapted to impart a gyratory movement to one end of the screen frame in a substantially horizontal plane; vibrating means on the base for imparting a vertical vibratory movement to the other end of the screen frame; connecting means between the screen frame and the gyrating means such that the screen frame may rock vertically on the gyrating means; and supporting means for the screen frame adjacent the vibrating means such that the screen frame. may rock vertically on an axis at the first mentioned end and horizontally on an xis at the second mentioned end. a

' 2. Screening apparatus comprising a base; a screen frame; gyrating means comprising a vertical shaft, a fly wheel secured thereto. a selfalining bearing secured to the fly wheel eccentric to the axis of the latter and a pin depending from one end of the screen frame and received in the bearing; vibrating means on the base for imparting a vertical vibratory movement to the other end of the screen frame; connecting means between the screen frame and the gyrating means such that the screen frame may rock vertically on the gyrating means; and supporting means for the screen frame adjacent the vibrat ing means such that the screen frame may rock vertically on an axis at the first mentioned end and horizontally on an axis at the second mentioned end.

3. Screening apparatus comprising a base; a screen frame; gyrating means on the base adapted to impart a gyratory movement to one end of the screen in a substantially horizontal plane and to support the said endfor swinging vertically; a shaft journalled on the base transversely of the screen frame and remote from the gyrating means; eccentrics secured to the shaft; a saddle at each side of the device actuable by the adjacent eccentric to rise and fall; a resilient flexible connection between the saddle and the base to permit of a gyratory movement of the saddle in a vertical longitudinal plane; a V-track pivoted on each saddle to swing horizontally; and a V-guide resting on each V-track pivotally connected to the screen frame to rock in a vertical longitudinal plane.

4. Screening apparatus comprising a base; a screen frame; gyrating means on the base adapted to impart a gyratory movement to one end of the screen in a substantially horizontal plane and to support the said end for swinging vertically; a shaft journalled on the base transversely of the screen frame and remote from the gyrating means; eccentrics secured to the shaft; a saddle at each side of the device actuable by the adjacent eccentric to rise and fall; a resilient flexible connection between the saddle and the base to permit of a gyratory movement of the saddle in a vertical longitudinal plane; a V-track pivoted on each saddle to swing horizontally; a V-guide resting on each V-track pivotally connected to the screen frame to rock in a vertical longitudinal plane; and spring means holding the guides and tracks in engagement.

5. Screening apparatus comprising a base; a screen frame; gyrating means on the base adapted to impart a gyratory' movement to one end of'the screen in a substantially horizontal plane and to support the said end for swinging vertically; a shaft joumalled on the base transversely of the screen frame and remote from the gyrating means; eccentrics secured to the shaft; a saddle member suitably supported and guided to be gyratable in a vertical longitudinal plane by the adjacent eccentric; a V-track pivoted on each saddle to swing horizontally; and a V-guide resting on each V-track pivotally connected to the screen frame to rock in a vertical longitudinal plane.

6. Screening apparatus comprising a base; a screen frame; gyrating means on the base adapted to impart a gyratory movement to one end of the screen in a substantially horizontal plane and to support the said end for swinging vertically; a shaft journalled on the base transversely of the screen frame and remote from the gyrating means; eccentrics secured to the shaft; a saddle member suitably supported and guided to be gyratable in a vertical longitudinal plane by the adjacent eccentric; a V-track pivoted on each saddle to swing horizontally; a V-guide resting on each V-track pivotally connected to the screen frame to rock in a vertical longitudinal plane; and spring means holding the guides and tracks in engagement.

JAMES MESS. ROBERT STROUD. 

